在 Linux 平台使用 dbus-send 检测深色模式设置 (#5317)

Author: Glavo

HMCL/src/main/java/org/jackhuang/hmcl/theme/Themes.java

@@ -36,6 +36,7 @@
 import org.glavo.monetfx.beans.property.ReadOnlyColorSchemeProperty;
 import org.glavo.monetfx.beans.property.SimpleColorSchemeProperty;
 import org.jackhuang.hmcl.ui.FXUtils;
+import org.jackhuang.hmcl.util.io.FileUtils;
 import org.jackhuang.hmcl.ui.WindowsNativeUtils;
 import org.jackhuang.hmcl.util.platform.NativeUtils;
 import org.jackhuang.hmcl.util.platform.OSVersion;
@@ -46,9 +47,12 @@
 import org.jackhuang.hmcl.util.platform.windows.WinReg;
 import org.jackhuang.hmcl.util.platform.windows.WinTypes;
 
+import java.nio.file.Path;
+import java.time.Duration;
 import java.util.*;
 
 import static org.jackhuang.hmcl.setting.ConfigHolder.config;
+import static org.jackhuang.hmcl.util.logging.Logger.LOG;
 
 /// @author Glavo
 public final class Themes {
@@ -113,6 +117,7 @@ private static Brightness getDefaultBrightness() {
         if (defaultBrightness != null)
             return defaultBrightness;
 
+        LOG.info("Detecting system theme brightness");
         Brightness brightness = Brightness.DEFAULT;
         if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
             WinReg reg = WinReg.INSTANCE;
@@ -130,7 +135,38 @@ private static Brightness getDefaultBrightness() {
                 // If the key does not exist, it means Light mode is used
                 brightness = Brightness.LIGHT;
             }
+        } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX) {
+            Path dbusSend = SystemUtils.which("dbus-send");
+            if (dbusSend != null) {
+                try {
+                    String[] result = SystemUtils.run(List.of(
+                            FileUtils.getAbsolutePath(dbusSend),
+                            "--session",
+                            "--print-reply=literal",
+                            "--reply-timeout=1000",
+                            "--dest=org.freedesktop.portal.Desktop",
+                            "/org/freedesktop/portal/desktop",
+                            "org.freedesktop.portal.Settings.Read",
+                            "string:org.freedesktop.appearance",
+                            "string:color-scheme"
+                    ), Duration.ofSeconds(2)).trim().split(" ");
+
+                    if (result.length > 0) {
+                        String value = result[result.length - 1];
+                        // 1: prefer dark
+                        // 2: prefer light
+                        if ("1".equals(value)) {
+                            brightness = Brightness.DARK;
+                        } else if ("2".equals(value)) {
+                            brightness = Brightness.LIGHT;
+                        }
+                    }
+                } catch (Exception e) {
+                    LOG.warning("Failed to get system theme from D-Bus", e);
+                }
+            }
         }
+        LOG.info("Detected system theme brightness: " + brightness);
 
         return defaultBrightness = brightness;
     }

HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/SystemUtils.java

@@ -29,6 +29,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.time.Duration;
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeUnit;
@@ -75,12 +76,21 @@ public static int callExternalProcess(ProcessBuilder processBuilder) throws IOEx
         return managedProcess.getProcess().waitFor();
     }
 
+    private static final Duration DEFAULT_MAX_WAIT_TIME = Duration.ofSeconds(15);
+
     public static String run(String... command) throws Exception {
-        return run(Arrays.asList(command),
-                inputStream -> IOUtils.readFullyAsString(inputStream, OperatingSystem.NATIVE_CHARSET));
+        return run(List.of(command), DEFAULT_MAX_WAIT_TIME);
+    }
+
+    public static String run(List<String> command, Duration maxWaitTime) throws Exception {
+        return run(command, inputStream -> IOUtils.readFullyAsString(inputStream, OperatingSystem.NATIVE_CHARSET), maxWaitTime);
     }
 
     public static <T> T run(List<String> command, ExceptionalFunction<InputStream, T, ?> convert) throws Exception {
+        return run(command, convert, DEFAULT_MAX_WAIT_TIME);
+    }
+
+    public static <T> T run(List<String> command, ExceptionalFunction<InputStream, T, ?> convert, Duration maxWaitTime) throws Exception {
         Process process = new ProcessBuilder(command)
                 .redirectError(ProcessBuilder.Redirect.DISCARD)
                 .start();
@@ -90,7 +100,7 @@ public static <T> T run(List<String> command, ExceptionalFunction<InputStream, T
                     Lang.wrap(() -> convert.apply(inputStream)),
                     Schedulers.io());
 
-            if (!process.waitFor(15, TimeUnit.SECONDS))
+            if (!process.waitFor(maxWaitTime.toMillis(), TimeUnit.MILLISECONDS))
                 throw new TimeoutException();
 
             if (process.exitValue() != 0)